Facsimile system having rotating scanner moving longitudinally within stationary transparent drum



1950 c. J. YOUNG 2,532,799

FACSIMILE sys'rzu mvmc ROTATING scum uovmc LONGITUDINALLY wrmm gnu-10mm mmsmnsm nnuu Filed Aug. 1, 1944 3 Sheets-Sheet 1 ATTORN EY Dec. 5, 1950 Y c. .1. YOUNG 2,532,799

7 mcsmmz SYSTEM HAVING ROTATING SCANNER MOVING LONGITUDINALLY WITHIN STATIONARY TRANSPARENT DRUM 3 Sheets-Sheet 2 Filed Aug. 1, 1944 5 I I ATTO/Q/VEK 1950 c...|. YOUNG 2,532,799 FACSIIIILE sxsm HAVING ROTATING scmmn "OVING LOXGITUDINALLY WITHIN STATIONARY TRANSPARENT 'DRUI Filed Aug. 1, 1944 '3 Sheets-Sheet 3 Patented Dec. 5, 1950 UNITED STATES PATENT OFFICE FAcsiMrLE SYSTEM HAVING ROTATING SCANNER MOVING LONGITUDINALLY WITHIN STATIONARY TRANSPAREN DRUM Delaware Application August 1, 1944, Serial No. 547,550

rapidly by a movable scanning point. This disposition of the elements permits the use of a ,rotary scanning head substantially concentric with the curved subject copy sheet.

Scanning apparatus very generally of this nature is disclosed in thecopendingapplication of Charles N.

Gillespie, Serial No. 484.383, filed April 24, 1943, now Patent No. 2,443,953, granted June 22, 1948. However, in accordance with the present invention, the copy or record sheet i stationary, and the scanning point is advanced to obtain line by line scanning. In the description of the illustrative embodiment of the invention, which occurs hereinafter, a photoelectric scanning system for generating image signals will be described in detail, but as will be pointed out of appropriate places hereinafter, a machine embodying features of this invention may be constructed so as to function as a recorder of fac simile si nals and therefore claims appended hereto and directed to a facsimile machine are intended to cover both transmitters and re corders constructed in accordance with the teachingsof the present invention.

A scanner with a stationary cylinder for the sub ect copy facilitates rapid reloading, an essential feature in high-speed facsimile operation In the invention this result is attained by a mechanism directly coupled to the driving motor. Errors in svnchronism are avoided by not using gears or belts.

Furthermorethis result is. attained in a mini mum overall length considering that the scanner, recorder, and motor are arranged on one Thi minimum length results from the telescoping of the scannershaft into the recorder helix drum. Minimum length is also attained by the short scanning carriage of this invention.

The feature of an eXciter lamp rotating with its filament on the axis, and a phototube also on the axis but non-rotating, is important. A stationary is not practicable because the image of its filament will rotate as it passes along the surface of the copyholder, unless elaborate o tical measures are taken to prevent it. On the other hand, the phototube and first amplifier must be closely associated electrically and it is Claims. (Cl. 17 8-7.1)

not desirable to "rotate them both because a large number of slip rings would be required to handle the circuits.

Also, in accordance with thi invention, a novel facsimile machine is provided in which the subject matter to bescanned occupies substantially the entire circumference of the scanner sothat the scanning point, whichin a transmitter may, for example, be a focused beam of'light exciting a phototube, scans the copy sheet upon which the subject matter i inscribed or otherwise impressed along one dimension for each line operation of the scanner. Highly efficient scanning is attained in this manner by the use of a single exploring point, thuseliminating' the necessity for accurately aligning'two or more scanning points so that they will invariably follow the same path. Also, a ma'chine so constructed that the subject copy sheet occupies effectively the entire circumference of the scanner may be built more compactly than scanners employing a plurality of scanning points.

The means for imparting driving movement to the scanning head andmaintaining a fixed relationship between the scanning head and a copy holder during a scanning operation in a facsimile machine of the type in which a message sheet is curved so as substantially to surround the scanning head are important features of the present invention. Appropriate marking means will, of course, be used in a recorder utilizing inventive features of this invention.

The construction ,of the machine of the present invention is such that a portion of each scanning line is inherently reserved for the generation of a special or indicial signal. A novel arrangement for obtainingthis special signal is disclosed herein.

Apparatus for accomplishing these results comprises essentially a frame or support upon which is mounted a movable scanning instrumentalitv which includes a scanning head adapted to rotate with respect to the copy holder and to traverse the copy holder axially. A drive motor situated exteriorly of the copy holder imparts a motion of rotation directly to the scanning head, and a suitable advance mechanism provides the coordinated axial movement of the scanning head. A photocell which is energized in accordance with light reflected through the scanning head devel- Ops an image signal output. The photocell is ener ized by light of undiminished brilliance from the light source' to develop the special or indicial signal.

In view of the foregoing, the principal aim of Still another object is to provide a novel fan-- simile machine having an optical scanner in which the scanning head is concentric with a stationary transparent cylindrical. copy. holder.

which surrounds the scanner'head so as to provide a line scanning operation and a special signal. generating operation for each; revolution. of the scanner head.

Other objects and advantages of the present invention will, of course, become apparent and.

immediately suggest themselves to those skilled in the art to which the'invention is directed from a reading of the; following specification in connection. with the; accompanying. drawings in which-r Fig. 1 is an elevational view'ofi'a portion of a machine embodying; the invention taken partly insection on line i--l:.- of Fig; 2;

Fig. 2;.is' a detailed. view'in end elevation taken partly in sect on. on: 1ine.-2-.-2 of Fig- 1;

Fig. 3 isa sectional. view. similar to Fig. 2 but 7 takenon line 3-3 of Fig. 1;

Fig. 4 is a. View in. plan; drawn tmareduced scale and partlyinhorizontala section. of the complete machine of- Fig. 1;.

' Figs. 5-and G are details drawnto an enlarged scale of certainof-the; par-ts shown-inFig. 4; and

Fig., 7 is adiagrammatic showing of: a s stemin which a. machine. or: machines. of the present invention. mavbe employed to provide facsimile. communication.

Referring to the drawings and. for thepresentvto-Figs. Sand-4 thereof,.a..machine l0, constructed. to. embody the. present invention, is. disclosed which comprises aibase' l2 forming the principal. support. for. the operating parts and driving. mechanism.. Mounted upon this base is a supporting frame for. supporting the copy holding meansv and the scanning carriage guide ,.means..comprising. endplates l4 and. I5 forsupporting and positioning guide rails 22 and 24 anda pair of: angularly shapedspacing members |8.and. 2B; This frame. composed of the parts just. mentioned, in addition to supporting the guide rails 22..andv 24, also servestosupport and position a transparent stationar cylindrical copy holder or. message sheet support 25. A scanning carriage. indicated. generally by reference character 26,. which. will. be described more in detail. hereinafter, isimovably. mounted on the guide rail 22 by a pair of. rollers 23 and a pain of rollers.- 29, and. on the guide rail 2 by a pair of rollers. 31. and a pair" ofrollers 32. A scanning head 33, als tobe described more in deta l hereinafter, is? rotatably mounted on the carriage by means of; aball bearing assembly 36. A motor 31-, secured to-the base l2, imparts driving power to the scanning head 33' byway of a'telescopingconnection comprising a square tubular shaft 3-8 and'a shaft 39 secured to the scanning head.33. Detailsof theconnection between the telescoping -shafts38 and 39 are shown in Figs. and, sand; will: be: described herein after.

Referring. nowto-Figs. 1, 2, and 3, the'details of the support for the transparent copy holder cylinder 25 and the guide rails 22 and 24 will now bedescr-ibed: The. endplate, members 14 4 and I5 are similar and therefore a detailed description of member l6, appearing in Fig. 2, will be given. A single opening 4| (Fig. 2) is provided in the end plate having a principal circular section 42. and other circular, sections 43 and 44. The outline of these three circular. sections is preferably carefully machined and their centers are carefully located with respect to each other so that the guide rails 22 and 24, seated in the sections 43 and 44 respectively are accurately positioned with respect to the copy holding cylinder 25; which is seated at or adjacent its end in the circular section 42. Each end of the copy holder 25is retained in position in the circular' section .2. of the aperture by means of a ring 48 (Figs; 1 and 2) which is forced outwardly against the. copy holder by blocks 5!, each of which is secured to the sloping edge 53 of the opening. 4! by suitable fastening means such as a screw 54. The same; arrangement is employed tosecure. bothends. of. the copy holder 2.5..in. the plate i4 andthe plate I6, and. similar reference characters have been. usedon. Fig. 1 to indicate thefastening for the plate [4. The angularly shaped spacing members may be. secured at their ends to=the.plates. l4 and. Why screws 55 or the like. The. lower edgesof. the copy holder 2.5,are continuously supported between the plates 54. and.- HS by. the. upper edge, of. each spacing member l8. and. 251,. respectively and an angle member. 58. (Figs. 1'. and 3) Each. angle member is; secured to. its respective spacing. member. by means, of. screws or other. suitable fastening means. 59..

The carriage 25, which. rotatably supports the scanning head. 3.31,, will. now. be. described; in detaiL. Itcomprises an. end;member a2 having. a configurat onwhichis best shown by Figs. 2 and 3 of the. drawingsandan end member 63. These two end members are joined by an angularly shaped. member 65;. secured to. each in any suitable manner such as by welding. The end member 53 is shaped like the.lower part of the end member 62, and thel'atter is seen to begenerally diamond shaped in outline with a centered aperture 68. A. slot 99. between the. points of connection of the rollers.3l and 32 on each end member provides for adjustment. of the; carriage upon the guide. rails: 22 and 24. This adjustment is effected by apinch screw H which is threaded into a hole 13; The aperture 68 conveniently receives one of the tubes M of a pre amplifier (not shown in detail) which is carried by a bracket 15 shock mounted on the end'member. 62 of the carriage.

The upper end of the end member 62 is substant ally circular in outline. as shown and is fitted. with. the outer race. member 78 of the previously mentioned ball bearing. assembly 35.

A ring. 8| (Figs. 1 and 3) secured to the end member; 62 by any. suitable fastening means, such as screws. 82.. and. 8.3, assists, in. retaining the race 1.8.. in the recessedopening 84. A curved transparent or translucent light transmitting member 85,. preferably formed of plastic or quartz; for which the. material. known. by the trade-mark Lucite? has been found useful. This element. is seated in a. curved recess formed at the top of the-member- 62-. The light transmitting member 86 may be retained in position in... this recess by a housing member 88 (Figural) which-fitsover theend member 62 to protect andelectrically shield the parts mounted on thebracket 16 among which is aphototube or a: photocell 89. The; photocell. 89 generates I90 of the body portion 99.

signals representative of pieces of subject copy on the cop holder 25, and also generates special signals by means of light of substantially undiminished brilliance transmitted at intervals through the member 86.

The previously mentioned scanning head 33 is secured, for example, by screws 92 to the drive shaft 39 which, as previously stated, has a telescopic connection with the squared shaft 38.

The latter is rotatably supported in sleeve bearings 95 and 95a. The end of the shaft 38 carries worm 98 and is coupled to the motor 31. The arrangement just mentioned, together with the bearing assembly 36, provides for accurate alignment of the center of the rotatable scanning head 33. The inner race of the bearing assembly 35 is held in position on the tubular end II!!! of the scanner body 99 by means of a threaded ring nut I Ill I is stationary for reasons stated. A slip ring I04 provides an electrical connection to one terminal in the lamp I93 from a brush I95, the other end of the lamp being grounded on metallic parts of the scanning head 33. A low resistance ground connection is provided by a second brush I I38 which bears on the periphery of the shaft cou- 'pli The sharply focused luminous soot, which scans a sheet in position on the copy ho der 25. is provided by an adiustable mirror I II! from which light is projected through ali ned openin s in a mirror sup ort I I I and a mirror I I2 and through a lens combination H5. The mirror II) may be ad ustably mount d in a convenient manner by forming a reflecting surface on or securing the mirror III! to a rod H3 (Fi 2) which is insertable in a transverse bore H4 in the bod portion 99. A tubular member IIB which is or ma be inte ral with the mirror holder III serves as a light haifie for the scanning beam which is rojected from t e mirror I I and pr vents any i ht from assing directly from lamp I03 to phototube axis of the cylinder 25.

The lens combination H5 is seat d in a lens tube H9 which is ad ustabl t lescopically in a lens tube holder H9, the latter being seated against the s oulder of a cylindrical rec ss I22 which commun cates with a bore I23 in the end A reflector I26, substantial y elli soidal in s ape with one focus on the surface of the copy holder 25 and the other at the plate of the phototube 89. so as to collect the maximum amount of light reflected from the message sheet, rests on one end on the lens tube holder II 9 and supports a transparent member I28 at its upper end. The lens tube holder H9 and its associated parts, including the reflector I26 and the member I28 are held in position b a clamping member I29 secured by a threaded ring I3! which engages threads formed at the outer end of the recess I22. Reflected li ht which is collected from the message sheet by the reflector I26 is projected by the mirror 2 on to the (Figs. 5 and 6).

6 phototube 89 through the bore I23, the centerof the beam lying along the axis of rotation so that the spot of light shall remain substantially in one position on the phototube plate.

The optical system just described for scanning a message sheet on the copy holder 25 is accurately positioned relative to the copy holder 25 in the manner previously pointed out by the accurate location of the section 42 and the sections 43 of the aperture 4| in each end plate I4 and I9 so that the optical path from the light source, shown illustrativel as the lamp I93, to the subject and from there back to the phototube is always identical. Since defocusing of the scanning beam is prevented, adequate sharpness in the received image will bepresent.

The special or indicial signal provided by proiecting light of relatively undiminished brilliance from the lam I93 onto the phototube 69 is generated. by the following apparatus; A tube I36 is secured in an inclined recess in the body member 99 by a set screw I3! and contains a lens I39 and a mirror I4I, A-beam of light I43 from the lamp I03 is focused sharply in the plane of the ring member BI by the lens I39, the optical path from the lens including the mirror MI. Since specular reflection is obtainedr'from the mirror I, the light intensity in the plane of the ring 8| is more intense than the light intensity projected onto the nhototube over the optical path from the normall less reflective surface of the message sheet on the copy. holder 25. In the position of the parts shown in Fig. l, the scanning beam from the lens I I5 is midway of its scanning traverse, and the beam projected through the lens I39 is obstructed by the surface of the ring 8!. When the scanning beam has complet d its scanning traverse, that is to say, after it has passed beyond one edge of the copy holder 25 and is moving in the idle s ace b tween the brackets 58 (Fig. 3), the arcuate slot I44 in the ring 8| permits the beam from the lens !-39 to impinge on the ex osed end of the light conducting memb r 96 which pro ects it with substantially .undiminished intensity into the phototube 89. Accurate adiustment of the time duration and the time at which the illumination of the photocell b the beam I43 begins and ends is provided by arcuatel movable shims I48 and I41, each of which is rovided with an elon ated slot I49 througlrwhich the screw, 83 is assed. To insure proper seating of theshims M6 and I41, an arcuaterecess-ISI is preferably rovided in the face of the carriage end member 62 so that the screws 83 serve to clam the s ims between the bottom of this recess and the rear face of the ring 8!.

The shaft 39, as previousl stat d. fits t lescopically in the squared shaft 38 which is rotatablv su orted at both ends in the sleeve bearings and 95a.

The sleeve bearing 95'is rotatab y carried by a bearing plate or pedestal I54 and bearing by plate I54a, (Fig. 4). To' avoid any undue vibration at the end of the shaft 39 which would cause irregularities in the received copy, the arrangement shown more in detail in Figs. 5 and 6 is employed. This arrangement provides firmness to prevent angular lost motion of the telescoped shafts while permitting a free sliding action. The shaft 39 is fitted with a plug I56 which has a rectangularly shaped extension I53 The smaller dimension of this rectangle is such that space is provided between the interior walls of the shaft 38 and the plug asscgrzee I53 to: acccmn'lodateza. roller: I58; on each side; Theserollers: I592 316% carried by a: pin; 16!. fixed in the rectangular extension, [58. A; pair of rollers I63 are mounted: on anfioating pin I64 which slides inan: open-aended: slot; I161. A compression spring: I65 .presses:the pin I54 forwardly so thati-the-rollerslw contacttherollers I59: and a wall of the squared shaft: 38. This arrangement: permits. the shaft. 39 to be slidable freely inthe square-shaft. but;maintains aconcentric and rigid; angular relationship between these shafts.

The ring: 48 and the: blocks; 51 may be brazed together so: as to insure. location of the parts. All metalparts: preferably are accurately positioned by measurement before locating. the light transmitting copy? holder 25;.

The helix drum-1 I68 of. a recorder; similar to that disclosed in; the Young; Reissue Patent No. 20,152, granted- October 27,',1'936,is:carried on the shaft: 38 between the-1 plates" I54 and l'4a, detailed parts: of the recorder not being shown. The drum l68is: provided:with a; helix I69 which cooperates with:theprinter bar 110'; Application i ofsigna'ls'to the: printer bar for electrolytic recording mayb'etaccomplishedfin any" well known manner, or the bar may oscillate in response to signals. for carbon. recording" as shown in the Youngpatent. referred tot Thus; the: machine ofthelinvention is:v a scanner-recorder for either sending orreceiving; or both.

The carriage zfi isimoved toward the right, as viewed in Figs; 1i andi 4gduringra scanning operation by a: cord! l1]; secured to the carriage at the: point indicated." by'reference character I12. A slot I'll!" in that base [2i accommodates the connection: H2: The cord HI is wound on a drum I13 secured'fto a shaft which is driven by a wormwheel. H3" from: the worm 98. A bearing bracket; [11 rotatably supports the shaft I 16. The worm. wheel H8 is securedto' a shaft I19 supported? by a. bearing bracket l8l. These shafts I16 and 119' are interconnected by any known type of releasable-clutch, for example-the toothed dogv clutch- 186: The driving member of the clutch: is normally forced into engagement withthe driven: member bya compression spring I88" and clutch releases is effected by a lever I91 which isforked to'zengage a clutch release collar :92: Whenthe clutch I86 is released, a spring tension drum I94 winds: up a cord [96 which returns the. carriage 26 tothe left in preparation for a succeeding scanningoperation;

The completemachine which has just been described is capableof 'operation asa transmitter to produce: image-signals representative of subject matter mounted upon the; copy holder and also toproduce special signals bearing a predetermined time relationship with respect to each trainof image signals: constituting a scanning line. The message sheet, which normally will have a width equal to the: circumference of the transparent copy holder 25 minus the gap betweenclarnps 58 maybe secured in any suitable-manneruponxthecopy'holder, and it isto be noted that: inasmuch. as the copy holder is stationary, arr elaborate holding arrangement is unnecessary. Spring clips maybe employed for this purpose, Use of the: novel machine as a recorder has beenlmentionedabove, and its operation. in this. capacity will not be described: in detail. 7

Fig. 7. of the drawings shows, illustratively, a portion of; atypical facsimilesystem in a-simplificdfiormwhichz may,- be similar. to that. disclosed 8 inRatentNo. 2,326,740, granted to. Maurice-Artzt, August 1'7, 1943. This system of. Fig. 7 shows illustratively one use ofthe specialsignal generatedby the direct beam I43 when it occursin the interval between the scanning lines. Other uses will occur to those skilled in the-art.

The phototube 89 of Fig. '7, which is, for purposes of illustration, the phototube of the machine is shown in Fig. 1 of th-edrawings, has its'anode lead connected to any desired source of positive potential 29%. The cathode of this tube is connected to groundthrough a load resistance 20!, and'the control grid-262 of a tube 203 is connected to a positive point on this-resistance; Ihe tube 283 may'correspond to the tube 14' of Fig. 1. The cathode and suppressor grid of the tube 283' are connected by a conductorZM to a point on a potentiometer which is indicated by reference characters 206 and 29'! joined between ground and the cathode of a tube-2E6. The tube 2-! has its grid 2H connected to the plate of the tube 263. This last described connection. is a modification of the system shown inthe above noted Artzt' patent inasmuch as it is not necessary to employ a commutator or other separate arrangement toobtain the special signal which is employed in the system of Fig; 1 of the patent for phasing the copy. The screen grid of the tube 203 may be connected as shown to a suitable-source of positive voltage. Theplate'oi the tube 2il3- is connected through a resistance Hi to a positive source of plate voltage which. is also connected to the cathode of thetube 21.8. The tubes 263 and 2H! are D. C. amplifiers for the image signal output which maybe employed in any desired manner or in accordance with the above noted Artzt patent. The output may be obtained, conveniently, by connecting thean'ode of the tube 2E8 through an appropriate resistance 215 to-asource of relatively high positive voltage. The-final output of the-D; C. amplifier appears at the point 218.

Assuming that a message sheet with subject matter for transmission is secured to the copy holder 25 in the manner previously discussed, and that the clutch tilt of Fig. 4 has been released toplace the scanning carriage 25 in its initial position at the left of Fig. 1; the scanning head 33 will rotate, and the carriage will advance to the right upon engagement-or" the clutch at an appropriate speed to give equally spaced scan? ning lines. Foreach' revolution of the scanning head a continuous train of image signals will be generated followed by an accurately timed phasing signal. The latter occurs when the sharply focused beam M3 is transmitted through the light transmitting member 35 directly to the phototube 39; This results in the production of a super-white phasing signal in the apparatus of Fig. 7.

The arrangement of the carriage; parts and the guide rails 22- and 2.4 is such that the carriage may readily be removed by drawing it toward the right as viewed on Fig. 1 of the drawings until the rollers secured to the member 53 have. been disengaged from the guide rails. This process is simply reversed in order to re-install the same carriage, a similarly equipped carriage, or. a carriage. equipped with a recording lamp-to record signals photographically, for example. The. scanning point is effective from one end of the copy holder 25 at the plate It: to the other end at the plate 86.

Various alterations may-be made in the present invention without departing from the spirit and 9 scope thereof, and it is desired that any and all such alterations be considered within the purview of the present invention as defined by the hereinafter appended claims.

Having now described the invention, what is claimed and desired to be secured by Letters Patent is the following:

1. Facsimile apparatus comprising a cylindrical light transmitting copy holding member for supporting a message sheet, a rotary scanning device positioned internally of said copy holder with said scanning device being adapted to rotate upon an axis substantially coinciding with the axis of said copy holder, means for causing said rotary scanning element to move longitudinally of said copy holder, supporting means including guide elements positioned externally of said copy holder but parallel thereto, carriage means for traversing said guide elements, and means extending through a longitudinal slot in said copy holder for interconnecting said scanning device and said carriage means.

2. Facsimile apparatus comprising a cylindrical light transmitting copy holder, a rotary scanning device positioned internally of said copy holder, means supporting said scanning device for rotation upon an axis coinciding with the axis of said holder, said copy holder having a slot longitudinally thereof, said scanning device being provided with a slot in a predetermined angular position with respect to said longitudinal slot, and means energized from said scanning device through said slot in said scanning device for developing a special signal once in each revolution of said scanning device when said scanning device comes intoregister with said slot in said copy holder.

3. Facsimile apparatus having a transmitting scanner and a recording scanner, said transmitting scanner comprising a stationar copy holder, a rotatable scanning device associated with and within said copy holder, means for axially advancing and rotating said scanning device within said copy holder, and an extensible driving connection between said last named a means and said recording scanner.

4. Facsimile apparatus having a transmitting scanner and a recording scanner, said transmitting scanner comprising a stationary cylindrical copy holder, a rotatable scanning device concenah trio with and movable internally of said copy holder, means extending through the axis of said copy holder for advancing and rotating said scanning device, and an extensible driving connection between said last named means and said recording scanner.

5. A facsimile scanner comprising a cylindrical light transmitting copy holder, a scanning device, a carriage member for supporting said scanning device adapted to pass through a longitudinal slot in said copy holder, said scanning device being concentric with said cylinder and axially movable with said carriage, said scanning device having a light source located on the axis of concentricity, optical means for producing a scanning light spot on a surface of said copy holder and arranged to direct the reflected light from the subject matter in contact with said surface so that it passes out of said scanning device along said common axis, and a phototube on said carriage to receive said reflected light.

6. Facsimile apparatus comprising a cylindrical light transmitting copy holding member for supporting a message sheet, a rotary scanning device positioned internally of said copy holder with said scanning device being adapted to rotate upon an axis coinciding with the axis of said copy holder, support means including guide elements substantially parallel to said cylinder, means for causing said rotary scanning element to move longitudinally of said copy holder, carriage means for traversing said guide elements, and means interconnecting said scanning device and said carriage means extending through a longitudinal slot in said copy holding member.

7. Facsimile apparatus comprising a cylindrical light transmittingcopy holder, a rotary scanning device positioned internally of said copy holder, means supporting said scanning device for rotation upon an axis coinciding with the axis of said copy holder, means energized from said scanning device for developing an indicial signal once for each revolution of said scanning device, and an adjustable means for setting the time duration and time of occurrence of said indicial signal.

8. A facsimile machine comprising a stationary cylindrical copy holder, a movable scanning head in said copy holder, means to support said movable scanning head within said copy holder, a scanning head drive shaft extending externally of said copy holder, a hollow power drive shaft axially aligned with said scanning head drive shaft to receive said scanning head shaft internally thereof, means internally of said drive shaft for causing both of said shafts to be rotatable as a unit but permitting free sliding action therebetween and a complete disengagement of said shafts to permit removal of said scanning head from said copy holder, and power drive means connected to said drive shaft.

9. The combination of claim 8 wherein said drive shaft has secured thereon a scanning member, and means cooperating with said scanning member to scan a recording web in cooperation with said scanning member.

10. Facsimile apparatus comprising a transmitting scanner and a recording scanner, said transmitting scanner comprising a rotatable and axially movable scanning device, said recording scanner comprising a, rotatable drum having scanning means thereon, said scanning device and said drum being in axial alignment, an operative interconnection between said axially aligned scanning device and said drum in the form of an extensible power transmission connection, and means axially aligned with said device and said drum for applying mechanical power to said device and said drum, said last named means including an electric moto having its rotor mechanically coupled to said drum.

CHARLES J. YOUNG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,740,490 Wright et a1 Dec. 24, 1929 1,854,014 Ballentine Apr. 12, 1932 1,857,130 Alexanderson May 10, 1932 1,874,200 Manderfeld Aug. 30, 1932 2,122,974 Browne July 5, 1938 2,163,215 Schlessinger June 20, 1939 2,298,911 Young Oct. 13, 1942 2,317,850 Finch Apr. 27, 1943 2,394,649 Young Feb. 12, 1946 2,413,400 Young Dec. 31, 1946 

